getImageCompression
Get the compression filter used on an image.
getImageCompression([in] int idx, [out, retval] BSTR *comp)
This function returns the compression filter, if any, used on the
idxth image on the page specified in the last
call to getImages. It returns an empty string if the image is not
compressed.
The compression filter names (as of PDF 1.7) are:
LZWDecode, RunLengthDecode,
CCITTFaxDecode, DCTDecode (JPEG),
FlateDecode, JBIG2Decode, and
JPXDecode (JPEG 2000).
VB:
pdf.getImages(1)
nImgs = pdf.numImages
For i = 0 To nImgs-1
comp = pdf.getImageCompression(i)
MsgBox("image " & i & ": " & comp & " compression")
Next i